My Kirkham has an undercar exhaust and the headers were fabricated by them. Couple of thoughts though:
Mickmate does make nice headers. I looked at them before I found out that Kirkham would make them for me.
Don't count on 3" downpipes and collectors. Very unlikely to fit 3" under the car. I have 2.5" to the mufflers and that's a squeeze.
Tuned length primaries?? You've got to be kidding! Have you looked in the engine bay of a Cobra with an FE before?
